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MSI A55M-S41 micro-ATX motherboard, dark PCB with blue and black slots, silver I/O shield

MSI

MSI A55M-S41 Socket FM1 AMD A55 motherboard DDR3 16GB

SKU CH-W5V4-ACT6J

Micro-ATX board for FM1 APUs with dual-channel DDR3 up to 16 GB, one PCIe x16 slot, four SATA ports, Realtek audio and gigabit LAN

  • CPU Socket TypeSocket FM1
  • CPU TypeAMD Llano APU, FM1
  • ChipsetAMD A55
  • Memory StandardSupport dual-channel DDR3 1866/1600/1333/1066MHz memory
  • Maximum Memory Supported16GB
  • PCI Slots1 PCI Express x16 slot 1 PCIE x1 slot 1 PCI slot
  • Supports dual-channel DDR3 up to 1866 MHz for responsive multitasking
  • Realtek ALC662 delivers six-channel audio for clear sound output
  • Gigabit LAN with Realtek 8111E enables 10, 100 and 1000 Mb/s wired networking
  • Four SATA ports provide storage expansion for drives
  • Micro-ATX Socket FM1 board fits compact builds with AMD Llano APUs

Socket FM1 DDR3 board for Llano APUs

This micro-ATX motherboard uses the AMD A55 chipset and accepts Socket FM1 processors such as the Llano APU line. It targets budget builds or repairs that need dual-channel DDR3 support up to 16 GB. The layout provides one PCI Express x16 slot, one PCI Express x1 slot and one legacy PCI slot for expansion.

Dual-channel DDR3 up to 1866 MHz and 16 GB

Memory support is the deciding specification: the board runs dual-channel DDR3 at 1866, 1600, 1333 or 1066 MHz and caps total capacity at 16 GB. Four SATA II ports are available for storage, and the Realtek ALC662 codec delivers six-channel audio.

Realtek GbE and steady desktop operation

The onboard Realtek 8111E controller handles 10, 100 and 1000 Mb/s Ethernet over a PCI Express 1.0a link. With no overclocking features listed, the board is intended for standard desktop workloads rather than sustained high-current stress.

Highlights

  • Supports dual-channel DDR3 up to 1866 MHz for responsive multitasking
  • Realtek ALC662 delivers six-channel audio for clear sound output
  • Gigabit LAN with Realtek 8111E enables 10, 100 and 1000 Mb/s wired networking
  • Four SATA ports provide storage expansion for drives
  • Micro-ATX Socket FM1 board fits compact builds with AMD Llano APUs

Specifications

BrandMSI
SeriesMSI A55M-S41
ModelMSI A55M-S41
CPU Socket TypeSocket FM1
CPU TypeAMD Llano APU, FM1
ChipsetAMD A55
Memory StandardSupport dual-channel DDR3 1866/1600/1333/1066MHz memory
Maximum Memory Supported16GB
PCI Slots1 PCI Express x16 slot
1 PCIE x1 slot
1 PCI slot
SATA RAID4XSATA II interface
Audio ChipsetRealtek ALC662 Chip
- Supports 6-channel sound effects detected by intelligent sound interface
Compatible with Azalia 1.0 specifications
LAN ChipsetRealtek PCI-E GbLAN Controller REL8111E Chip
Supports 10Mb/s, 100Mb/s and 1000Mb/s
Compliant with PCI-Express bus specification v1.0a.

Questions about this item

How does the 16GB DDR3 limit translate when I install four 4GB modules?

The board runs dual-channel DDR3 up to 1866 MHz; four 4 GB sticks fill the 16 GB ceiling and operate at the highest speed all modules share.

What does the single PCI Express x16 slot actually deliver for a graphics card?

The slot is wired for one x16 device and is governed by the AMD A55 chipset, so the card runs at the electrical width the chipset provides.

Will the Micro ATX form factor fit my standard ATX case and line up with the I/O shield supplied?

Yes, Micro ATX boards mount in ATX cases using the standard standoff pattern, and the included chassis I/O back panel matches the board’s port layout.

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